TWI244327B - Electronic device and control method used therein - Google Patents

Abstract

Electronic device and control method used therein. The electronic device comprises a tuner, a video capture device, and a potential selector. When the potential selector is applied with a first potential, both of the tuner and the video capture device are powered by a first power source of the first potential, and, when the potential selector is applied with a second potential, only the video capture device is powered by a second power source of the second potential.

Description

1244327 V. Description of the invention (1) [Technical field to which the invention belongs] The present invention relates to a TV Box having a tuner and an image capturing device, and particularly to a power supply that can be listed according to the coupling Is it possible to supply a TV box with a spectrum modulator and an image mining device? ,

[Prior art] I Generally, a TV box (TV b〇X) will include both a video capture device (VIDEO image capture device) and a TV tuner (τν, transparent

Tuner). The image capture device (image capture device) uses a USB interface and a personal computer to perform image data and instructions. The I tuner is used to receive TV signals and convert video baseband signals. Figure 5 It is shown as the function of the conventional TV box. The TV box 50 is also coupled to the personal brain at the same time. ^ ”It is used to connect with the old interface and it is another power. The source and the computer host are transmitted V d C to supply images at the same time. The extraction device 5 5 uses the square and surface electricity two to f two electric power sources to capture digital photography / Germany and the television mode 56 electricity as a computer-recognizable signal! / Video or television signal 54 conversion because the TV tuner is working, 1.5 watts), if only from the USB interface to / to / consume a large amount of power (about the TV tuner will be due to the power " ^ i power, the TV Box said / U power is insufficient to work. But 疋 'as a conventional TV box and helmet power supply via USB interface ... external power supply, even if connected', keep the fan-like image capture device and TV

I m Page 5 0660 · A40180twf (η1); 92091; ALEXLAY ptd 1244327 V. Description of the invention (2) When the tuner is also equipped with a helmet power supply, it will be taken if the user goes out or does not have a suitable transformer image on hand. Jealousy ^ uses a portable computer alone to drive the logic in the TV box, and making ^ # 用 ^ is inconvenient for the related image processing for the real-time captured image. SUMMARY OF THE INVENTION In view of this, Tai Huan ηα is based on the main purpose of the coupled power source J: to propose a TV box, which can supply power to the circuit. That is to say, it is possible to switch the TV tuner and the image capture device to enable the image capture device. The interface to supply the power of the TV box is still kind and selective. χ hanging work, and increase the use of the TV box (tUner), said the use of the 'The present invention proposes a TV box, including spectrum modulation for computer-readable signals; ^ 像 ^ ϋ. For example, the TV signal conversion devxce); A irSlCartUre and image capture # w ^ ^ are simultaneously powered to the tuner (tUner) to power the image selection device only when the voltage selection conversion device is connected to the second voltage level. Dry 1

If the electric current box of the switch is changed, the power supply circuit of the image capturing device can be automatically cut according to the connected power supply to increase the convenience of use. In addition, the present invention also proposes a kind of control, ^ ^ ^ Control methods include detection of dagger: γ position. According to the present invention, whether the sub-device is coupled to the first voltage level

1244327 ~ --- 5. Description of the invention (3) The second electric circuit of the circuit is set: when connected to the first and second electrical levels, power is also supplied to the first voltage level, and is coupled to the second electrical unit: electronic device The device is not coupled to the first circuit, and the second circuit is not “connected to the first circuit”. The first circuit and the second circuit are connected according to the power source of the electronic device. The following m ::, the above-mentioned purpose, features and advantages can be more clearly understood. The following is a detailed description of the preferred embodiment and the accompanying drawings, such as the embodiment: Power supply: ΐ: ΐ ί The purpose is to propose a TV box, which can be regarded as the normal operation of the Δ error power take-off device even if only by the u S Β interface, such as the operation of the thunder. Figure 8: shows the functional block diagram of the TV box of the present invention. The present invention includes: electricity; ... "Dai Yizhong 2, the voltage input terminal of the i ^ option 1 can be respectively coupled to the transformer power supply Vdc provided by a device, and the second voltage level 1 is a quasi-bit electricity The USB power supply Vusb provided by the USB interface of the brain-changing main press. #, ', Automated voltage detection device 10 < Measured voltage selection Jian Yi〗 set simultaneously with the USB power supply Vdc Vusb, for laser output control system to control the cross-〇660 ^ A40180twf (nl);. 92091; ALEXLAY.ptd Page 71244327

The turn-in control switch 12 is used to cut off the supply circuit of the USB power supply Vusb, and select the transformer power supply Vdc to supply the DC-DC converter 丨 丨 power to convert the voltage to the power supply Vdc and output the converted voltage And v〇2 to supply the TV tuner 14 and the image capture device 5 respectively; when the voltage selection device 1 is only connected to the USB power source Vusb, the voltage detection device 10 also outputs a control f voltage Vc to control the output Control switch 3 to cut off the connection between the output terminal and the TV tuner 14, and only the USB power supply Vusb is used to supply the power of the DC-DC converter 11 to convert the USB power supply Vusb into the power required by the image capture device 15 Vol.

In addition, a diode D may be connected in series between the transformer power Vdc and the power line Ls, as shown in FIG. When the power supply vdc of the transformer coupled to the TV box is removed, the diode D can be used to avoid the moment when the input control switch 丨 2 is turned on, because the instantaneous conduction surface current is fed back to the voltage detection device 丨 〇, which affects the input control switch 1 in normal operation. Say

FIG. 2 shows a circuit diagram of the voltage selection device 1 of the present invention, wherein the voltage detection device 10 is formed by connecting a first resistor Ri and a second resistor R2 in series, and a voltage across the second resistor! ^ 2 As a control voltage Vc. In addition, the input control switch 12 is a first transistor ..., the wheel-out control switch 13 is a second transistor Q2, and the first transistor Q1 and the second transistor are mutually exclusive, that is, when the first transistor is When Q1 is turned on, the second transistor Q2 will be turned off to enter the cut-off region. When the first transistor 91 is turned off (into the cut-off region), the second transistor Q2 will be turned on and enter the saturation region. Assume that the transformer power Vdc is 12V, the USB power Vusb is about 5V, the cut-off bias value Vtl of the first transistor Q1 is about -lv, and the cutoff of the second transistor Q2

1244327

The offset stopping value Vt2 is about iv, the first resistance is about 100 ohms, and the second R2 is about 10 k ohms. If the voltage selection device i is simultaneously coupled to a transformer; when Vdc and USB power supply Vusb, the voltage detection device 10 outputs a control voltage 'Vc, whose value can be pushed to approximately 丨 丨 88 based on the law of voltage division of resistance. ^, 1 =, This control voltage Vc is a voltage division value of the resistors R1 and! ^ 2, and is used to control the on and off of the first selling crystal Q1 and the second transistor Q2. . When the voltage selection device 1 is also coupled to the transformer power source Vdc disk usb electric source Vusb, the VG is 11 · 88ν and the source voltage of the first transistor (^ is equal to Λ, Vdc 'its value is 12V', so the first transistor Q1 Reverse source pressure

VGS is 11.88-12, which is equal to -0 · 12ν, and is smaller than the off-bias value vu, so the first transistor Q1 is turned off. @The second transistor q2 has a gate-source voltage vgs of 11.88V and is greater than the load-stop voltage Mvt2, so the second transistor ⑽ is turned on. When the first transistor Q1 is turned off and the second transistor q2 is turned on, the transformer c is coupled to the DC-DC converter via the power line Ls, so that the DC-DC converter 11 performs voltage conversion and outputs the first The three voltage levels ν〇ι and the fourth voltage level V02 are used to supply the image capturing device 15 and the television tuner 14, respectively. In this embodiment, the voltage v〇1 is about 3 3v voltage ... about 5V. In this embodiment, the first transistor Qi and the second transistor Q2 are respectively PMO ^ NMOS. However, the first transistor ... and the second transistor f Q2 of the present invention are not limited to this embodiment. It can be implemented with other electronic switching elements, such as BJT transistors.

If the voltage selection device 1 is only connected to the USB power source yusb and not to the transformer power source Vdc, and the voltage across the drain source of the first transistor qi is § 5V

1244327 V. Description of the invention (6) Then the source voltage is 4.5 V 'At this time, the value of the t-voltage detection device ⑺ voltage Vc is zero, so the gate-source reverse direction = the electric cut-off bias value VU, so the first Transistor Q1 is on;: 4.5 V and the voltage between the electrodes is also zero (same as Vc), so that the second transistor-is in a naturally off state. When the first transistor Q1 is turned on and the second transistor is turned off, since the second transistor Q2 forms an open circuit state, the circuit between the Q2 generator 11 and the TV tuner 14 is open, such as: f is input to the TV tuner 14. However, the USB power supply Vusb will pass the first transistor ..., the power line Ls, and the DC-DC conversion. 丨 丨 Connect two DC-DC converters U to perform voltage conversion, and output the second voltage Vol to the voltage selection device. FIG. 3 is a circuit diagram of a comparator according to the present invention. In addition to the resistor divider circuit of FIG. 2, the voltage detection device 10 can also be implemented with a comparison circuit to output a control voltage. Among them, the MB power supply Vusb is coupled to the shunt regulator (Shunt via the resistor R4), and when the shunt regulator 30 is turned on, 1 provides a voltage Vref of the ratio ΐΓ ;; in addition, the transformer is connected to the positive input terminal of the comparator 40 To provide a comparator with a positive input

At the same time, the power supply of the transformer W and the power supply VUSb are lightly connected at the same time. The USB power supply Vusb will make the parallel voltage regulator 30 and the voltage regulator 30 provide the reference voltage of the negative input of the comparator 40. Its value is 2.495V, J_, which consumes the transformer power connected to the positive input of comparator 40.

1244327 V. Description of the invention (7) If the reference voltage greater than i / A input terminal is used, therefore, the comparator 4 ° is referred to as C to control the first transistor Q1 and the second electric day- Deadline. When the comparison circuit is coupled to the USB power supply Vusb, but ::: when connected to the transformer power supply Vdc, the _power supply will make the parallel voltage ⑽ test two, one; the voltage comparator 30 will provide a negative value of the comparator 4 °: Which tea number voltage Vref should be? LLn ± The level at which the voltage at the input will be less than the positive value of the negative value. V. The control value Vc output when the value is input when the power is known is shown in Fig. 4. The flow chart of the control method of the TV box is shown in Fig. 4. First, the machine: source S4 ° 〇; detect whether the TV box consumes the transformer power S410, the right TV box is coupled to the transformer = and the video plug-in is 0; if the TV box is not 1 = power, only the video The capture device is powered by S43〇. Electricity wish: If Guang Guang uses the TV box of the present invention, he can switch the TV circuit § self-interest and the power supply circuit of the image capture device according to the input state of the TV box and the source state of the TV box. Therefore, when each f is connected to the USB interface of the host computer, the USB interface can still be used: power = to = image manipulation device, and the shortcomings of the USB interface and transformer are controlled by the signal of the USB interface to increase the convenience of the TV box. = The invention has been disclosed as a preferred embodiment. For example, the above M is used to help understand the present invention: "I am not used to limit the spirit of the present invention, and I am familiar with the art in this field and realize the spirit of the present invention" without departing from the spirit of the present invention. Inside, although it can be modified and replaced with some changes, its patent protection

1244327 V. Description of Invention (8) The scope shall depend on the scope of the attached patent application and its equivalent fields. 11 · 0660-A40180twf (nl); 92091; ALEXLAY.ptd Page 12 1244327 Brief Description of Drawings Figure 1 shows a block diagram of a television box according to the present invention. Fig. 2 shows a circuit diagram of the voltage selection device of Fig. 1. FIG. 3 shows a comparison circuit diagram according to the present invention. FIG. 4 is a flowchart showing a control method of the TV box. · Figure 5 is a block diagram of a conventional TV box. Figure 6 is a block diagram of a TV box with a protection circuit. Explanation of symbols: 1 ~ voltage selection device; 10 ~ voltage detection device; 11 ~ DC-DC converter; i 1 2 ~ input control switch; 1 ~ 3 output control switch; 1 ~ 4 ~ tuner; 1 ~ 5 ~ image Retrieval device; 30 ~ shunt regulator; 40 ~ comparator

Ql, Q2 ~ metal oxide transistor; R1-R 4 ~ resistor; V c ~ control voltage;

Vol, Vo2 ~ output voltage; f

Vdc ~ transformer power supply;

Vusb ~ USB power; D ~ diode. ·

0660-A40180twf (nl); 92091; ALEXLAY.ptd page 13

Claims (1)

1244327 6. Scope of patent application 1. An electronic device at least includes: a tuner, which converts an electrical signal into a computer-readable letter, an image capture device, and a voltage selection device Wherein, when the voltage selection conversion device is coupled to two first voltage levels, power is simultaneously supplied to the tuner and the image capture device, and when the voltage selection conversion device is coupled to the second voltage level Hour 'only powers the image capture device. 2. According to the electronic device described in item 1 of the patent application scope, the Douzhong section voltage selection device further includes: 1 Lei: Measure 4 'to test whether the voltage selection device is coupled to the first level; And a switch is coupled to the detection device. When the voltage selection μ = is coupled to the first voltage level, the tuner (tuna // / 3 is not included). If the patent application scope switch includes: Two control switches are coupled to the detection device, and when the voltage meets two, the first voltage level is coupled to the second voltage level Cut d, when the voltage selection device consumes the-voltage level, the level is connected to the power supply and the first and the seat are buried: ΐίControl On_ 'Corresponding to the input control switch, when the 1 k selects When the coupling ㈣-voltage level is set, the wheel-out control switch wheel: 1244327 VI. A please guide the third voltage level to the tuner 9. When the voltage selection device does not consume the first voltage level, cut off the third voltage level and the tuning spectrum. Pick up. ^ 4. The electronic device as described in item 1 of the scope of patent application, wherein the voltage selection device further includes: " a DC conversion device coupled between the input control switch and the output control switch, when the voltage When the selection device is connected to the first voltage level, it is used to convert the first voltage level into the third voltage level and a fourth voltage level 'for supplying the tuning device and the image capture device, respectively. . 5. The electronic device according to item 4 of the scope of patent application, wherein the input control switch includes at least a first transistor 'and the output control switch includes at least a second transistor. 6. The electronic device according to item 4 of the scope of patent application, wherein when the voltage-containing device including the first voltage is coupled to the first voltage level, the first transistor is truncated so that the first voltage level is coupled Connected to the DC conversion device, and the second transistor is turned on, so that the third voltage level is output to the tuner. 7. The electronic device as described in item 4 of the scope of patent application, wherein when the main voltage selection I is set and is coupled to the first voltage level, the first transistor is turned on to use the second voltage The level is coupled to the DC conversion device, and the second transistor is turned off to stop outputting the third voltage level to the tuner. 〇 口 8. The electronic device according to item 1 of the scope of patent application, wherein the first voltage level is greater than the second voltage level. 9. A method of controlling an electronic device, the electronic device having- 1244327 The level of the circuit and the circuit of the younger brother is more than one, and it is connected to a first #, 丨 θ ΐ —the voltage level, the method includes at least the following steps: $ 测 疋 no coupled to the first voltage Level; circuit-:::: when coupled to the first voltage level, powers both the speech circuit and the second circuit; and when the electronic device sets the second voltage level, the circuit supplies power . It is not coupled to the first voltage level, and it does not supply power to the first circuit. Only the first step: 10. If the method described in item 9 of the patent scope is included, the following steps are included as the electronic device. When the first voltage level is not coupled, the voltage: lightly connected to a power line; and when the second electronic device is coupled to the first voltage level, two of the first voltage level are connected. Connect to the side power line, and cut off the second voltage level from the power line, where 'the power line can be selectively coupled to the first circuit and the first, 1 1 The method described in clause 1, wherein the method A voltage detection circuit is used to determine whether the electronic device is coupled to the first power level. 1 1 2. The method according to item 9 of the scope of patent application, wherein the method uses a DC conversion device to convert the first voltage level into a third electro-chemical level and a fourth voltage level. ^ 1 3 · The method described in item 丨 2 of the scope of patent application, wherein when the electricity 0660-A40180twf (nl); 92091; ALEXUY.ptd Page 16 1244327 I VI. When the first voltage level is coupled to the first sub-device, please supply the first circuit with the second voltage level. And supplying the first circuit at the fourth voltage level. 14. The method according to item 13 of the scope of patent application, wherein when the electronic device is not coupled to the first voltage level, the first circuit is not powered, and the fourth voltage level power is used to supply power. Should be the second circuit. 15. The method according to item 9 of the scope of patent application, wherein the first circuit is a tuner and the second circuit is an image capture device. 16. The method according to item 9 of the scope of patent application, wherein the first voltage level is greater than the second voltage level. 0660-Α401801 wf (η1); 92091; ALEXLAY.p t d p.17